how to size up your pipe?charge that is
 

hey guys i'm in the middle of collecting peices for a hmt setup for my stock d16y7. i've got a starion front mount and a cx mani at my house. and i've already have a wrx turbo(td04l-13g) and some 450's on their way. i plan on managing it with a p06 and uber.

i'm trying to figure out: how do i decide which charge pipe diameter would be optimal for my setup? i figured 2" would be a good safe bet but i honestly don't know what would be the most efficient.

if you guys could shed some light on this that'd be great.

thanks i appreciate it,
-Luke

Re:how to size up your pipe?charge that is
 

2 is probably fine, but the bigger the better.

Re:how to size up your pipe?charge that is
 

bigger isnt better. with a smaller turbo there is no sense in having 6" IC pipes...

bigger pipes = bigger pressure drop, unless your turbo is massive...

i mean your turbo is 2" outlet, going to 3" pipe isnt gonna change anything because it has already gone through that 2" hole...

Re:how to size up your pipe?charge that is
 

you are correct in that its probably pointless to do more than 2" if the hole is 2". but I think he could enlarge the hole to as much as 3".

Bigger charge pipes dont create a pressure drop, just takes longer to reach full boost, but will net more power.

Re:how to size up your pipe?charge that is
 

it will not net more power if your going from 2" to 3"

if u had a hose, 1" to 3" flow is the same and pressure is less..

now explain how u would make more power with the same flow and more lag..

Re:how to size up your pipe?charge that is
 

I just based mine on the parts I used...

Turbo outlet was 2", Intercooler Inlet was 2", Intercooler Outlet was 2" (REDUCER HERE), Throttle Body was 2-1/2"

Badda Bing, Badda Boom... ;D

Re:how to size up your pipe?charge that is
 

wrong again. The only way huge ass chargepipes will create more power is with a huge ass turbo. There is no more power to be gained with making larger charge pipes. There's more cross sectional area to fill with boost, more lag and yes there even can be a pressure drop depending on the turbo size.

2-2.5 inch charge pipes is what you want. Anything smaller is too small and anything larger is dumb unless your building a 700hp motor

Re:how to size up your pipe?charge that is
 

hmm well 700whp was pretty close to my goals. i was shootin for like 170ish so....haha.. ;D ;D

i'll go with 2" pipes then. gotta email my tig welder and have him throw on some 2" inlet/outlets on my starion fmic.

thanks guys :)

-Luke

Re:how to size up your pipe?charge that is
 

I would reccomend 2 inch from turbo to intercooler , than 2.5 from intercooler to throttle body.

Re:how to size up your pipe?charge that is
 

i used 2.5" no probs

Re:how to size up your pipe?charge that is
 

I just looked at the diameter of the hole coming out the compressor and just used piping of the same size up to the intercooler; it was something like 1.25" ID and the throttle response was amazing. After the intercooler it stepped up to 2.25". I've looked at some "pro japanese" turbo drift cars and they seem to follow this logic for good throttle response (small pre intercooler piping followed by large piping going into the t.b.); but what do they know?? :P

Going purely on theory (usu not the best way), you want the smallest pipes possible without causing enough restriction to cause a pressure drop from the turbo to the t.b. Turbo's flow a certain cfm (volume/time) so the turbo will pump a certain volume of air per unit time. If you have big ass bling bling pipes it'll obviously take more time to pressurize the volume of the pipes.

The best way to figure it out? Use different sizes and see which one works best.

Re:how to size up your pipe?charge that is
 

correct, i didnt quite specify that. it all depends on how much air youre pushing. all i'm saying is that bigger charge pipes are better because they have more potential. and no you wont see hardly any difference between 2 and 3 inch charge pipes. I never said use 6 ::)

Re:how to size up your pipe?charge that is
 

I ran 2inch to the intercooler and 2 1/4 from cooler to tb, on a d16a6 and a t25 turbo. Seams perfect spools fast, maybe too fast :-\ I would go bigger for a dohc ;)

Re:how to size up your pipe?charge that is
 

I have a b16a2, i have a t3 60 trim with a 2" outlet, would i be better off running 2" from turbo to intercooler, and the 2.5" from the intercooler to tb? any suggestions?

Re:how to size up your pipe?charge that is
 

^^^ I would run 2.25 from turbo to cooler, 2.5 from cooler to tb. Get an reducing adapter to go from 2 to 2 1/4 ;)

Re:how to size up your pipe?charge that is
 

thanks much